(i) it is of the same manufacturer and model (or, at
 Lessee's option, an improved model), it is suitable for
 installation and use on the Airframe without impairing
 the value or utility of the Airframe and it is
 compatible with the remaining installed Engine, it has
 equivalent interchangeable modification status,
 equivalent or lower flight hours elapsed and cycles
 elapsed since Life Limited Parts replacement and since
 last Engine Performance Restoration, equivalent
 remaining warranty status as the Original Engine and
 equivalent or greater value and utility as the Original
 Engine; at the time of the engine replacement Lessor or
 Lessee, as applicable, shall adjust the Engine
 Supplemental Rent to reflect the maintenance utility of
 the replacement engine;

 (ii) it has become and remains the property of Lessor free
 from Security Interests (except Permitted Liens) and on
 installation on the Aircraft will without further act be
 subject to this Agreement; and Lessee shall supply to
 Lessor with an officer's certificate demonstrating full
 compliance with this Clause 8.13(a); and

 (iii) Lessee has full details of its source and maintenance
 records with back to birth traceability on all Life
 Limited Parts.